49ers lose Dixon to Bills

SANTA CLARA -- Running back Anthony Dixon, one of the 49ers' most enthusiastic players and electric personalities the past four seasons, has come to terms with the Buffalo Bills.

"So glad to be the newest member of the Buffalo Bills...gonna make this thang official in the morning... #BillsMafia," Dixon tweeted Friday night upon visiting the Bills, who later confirmed that Dixon had agreed to unspecified terms.

Dixon has wanted a shot at an expanded rushing role, and he vented that Nov. 17 on Twitter after a 49ers' loss at New Orleans in which he had no carries.

Dixon's passion otherwise served him well since arriving as a 2010 sixth-round draft pick out of Mississippi State. He excelled best on special teams but also became a versatile back who moonlighted as a fullback the past two seasons.

Dixon ran for two touchdowns each of his four regular seasons. In last season's NFC Championship game, he had a 1-yard touchdown plunge that put the 49ers ahead 10-0 in an eventual 23-17 loss at Seattle.